25.07.2022, 23:14
Quick update - I have been referred to the H273 specification which defines the format and content of the color hinting discussed above. According to this doc, the BT.601 recommendation has the following properties:
- Rec. ITU-R BT.601-7 525 (NTSC)
- BT470BG matrix
- BT.709/SMPTE 170M transfer
- BT470BG primaries
- Rec. ITU-R BT.601-7 625 (PAL)
- SMPTE 170M matrix
- BT.709/SMPTE 170M transfer
- SMPTE 170M primaries
Interestingly, the document suggests that `bt470bg` transfer is in fact equivalent to `gamma28`, which is not used by the BT.601 recommendation. Maybe VLC Player doesn't support it, so it defaults to BT.709?
The `gamma28` and `bt470bg` transfers are marked as historical, so that further makes me believe that they should not be used (and may not be supported by players, as we saw in the case of mpv, MPC-HC, PotPlayer, etc. above).
- Rec. ITU-R BT.601-7 525 (NTSC)
- BT470BG matrix
- BT.709/SMPTE 170M transfer
- BT470BG primaries
- Rec. ITU-R BT.601-7 625 (PAL)
- SMPTE 170M matrix
- BT.709/SMPTE 170M transfer
- SMPTE 170M primaries
Interestingly, the document suggests that `bt470bg` transfer is in fact equivalent to `gamma28`, which is not used by the BT.601 recommendation. Maybe VLC Player doesn't support it, so it defaults to BT.709?
The `gamma28` and `bt470bg` transfers are marked as historical, so that further makes me believe that they should not be used (and may not be supported by players, as we saw in the case of mpv, MPC-HC, PotPlayer, etc. above).